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164072
Alveoli Features & Breathing
Description
GCSE Biology (Gas Exchange) Mind Map on Alveoli Features & Breathing, created by 9arush on 11/08/2013.
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biology
gas exchange
biology
gas exchange
gcse
Mind Map by
9arush
, updated more than 1 year ago
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Created by
9arush
over 10 years ago
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Resource summary
Alveoli Features & Breathing
Alveoli features
Diffusion distance
Single layer of cells - rapid gas exchange
Increased surface area
Great number of alveoli
Dense network of capillaries
Supply of blood with low O2 & high CO2 concentration
Secretion of fluid
Allows gases to dissolve & prevent sides of alveoli sticking
Cilia
fine 'hairs' on cell surface
Beat in a co-ordinated way to carry mucus ( with trapped microbes & dust) away from the lungs
Goblet cell
Produces sticky mucus & releases it onto the cell surface
Breathing
At rest
CO2 level & blood pH are kept at safe level
During exercise
more air must be breathed in & out as muscle have to work harder
Deeper more rapid breathing
More CO2 lost from lungs
Deeper more rapid heartbeat
More blood pumped to tissues to carry CO2 away
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